// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'package:flutter/material.dart';

/// Flutter code sample for [SystemContextMenu] with custom menu items.

void main() => runApp(const SystemContextMenuExampleApp());

class SystemContextMenuExampleApp extends StatelessWidget {
  const SystemContextMenuExampleApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Custom Context Menu Demo',
      home: Scaffold(
        appBar: AppBar(title: const Text('Custom Context Menu Example')),
        body: const Center(child: SystemContextMenuExample()),
      ),
    );
  }
}

class SystemContextMenuExample extends StatefulWidget {
  const SystemContextMenuExample({super.key});

  @override
  State<SystemContextMenuExample> createState() =>
      _SystemContextMenuExampleState();
}

class _SystemContextMenuExampleState extends State<SystemContextMenuExample> {
  final TextEditingController _controller = TextEditingController(
    text: 'Long press to see custom menu items',
  );

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  void _showMessage(String message) {
    ScaffoldMessenger.of(
      context,
    ).showSnackBar(SnackBar(content: Text(message)));
  }

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.all(16.0),
      child: TextField(
        controller: _controller,
        maxLines: 3,
        decoration: const InputDecoration(
          border: OutlineInputBorder(),
          labelText: 'Text Field with Custom Context Menu',
          helperText: 'Long press to see custom menu items (iOS 16.0+)',
        ),
        contextMenuBuilder:
            (BuildContext context, EditableTextState editableTextState) {
              if (!MediaQuery.of(context).supportsShowingSystemContextMenu) {
                return AdaptiveTextSelectionToolbar.editableText(
                  editableTextState: editableTextState,
                );
              }

              return SystemContextMenu.editableText(
                editableTextState: editableTextState,
                items: <IOSSystemContextMenuItem>[
                  IOSSystemContextMenuItemCustom(
                    title: 'Clear Text',
                    onPressed: () {
                      _controller.clear();
                      _showMessage('Text cleared');
                    },
                  ),
                  IOSSystemContextMenuItemCustom(
                    title: 'Add Heart',
                    onPressed: () {
                      final TextSelection selection = _controller.selection;
                      final String text = _controller.text;
                      _controller.value = TextEditingValue(
                        text: text.replaceRange(
                          selection.start,
                          selection.end,
                          '❤️',
                        ),
                        selection: TextSelection.collapsed(
                          offset: selection.start + 2,
                        ),
                      );
                      _showMessage('Heart added');
                    },
                  ),
                  IOSSystemContextMenuItemCustom(
                    title: 'Uppercase',
                    onPressed: () {
                      final TextSelection selection = _controller.selection;
                      if (selection.isValid && !selection.isCollapsed) {
                        final String selectedText = _controller.text.substring(
                          selection.start,
                          selection.end,
                        );
                        _controller.text = _controller.text.replaceRange(
                          selection.start,
                          selection.end,
                          selectedText.toUpperCase(),
                        );
                        _showMessage('Text converted to uppercase');
                      }
                    },
                  ),
                ],
              );
            },
      ),
    );
  }
}